World Player of the Year Lionel Messi is a doubt for Tuesday's Champions League trip to Celtic after suffering a thigh injury in Saturday's match with Almeria.
Messi had to be withdrawn in the 28th minute, seven minutes after giving Barca the lead with a fine left-footed strike.
He was clearly in some discomfort thereafter and was replaced by Xavi Hernandez.
"Messi has a muscular injury in his right thigh," Barcelona said in a statement on the club's official Twitter account.
"Tomorrow, he will have more tests to discover the exact extent of the injury."
Javier Mascherano is definitely out of the trip to Glasgow, whilst Jordi Alba is also nursing a hamstring problem.
Messi missed Barca's trip to Malaga and the second-leg of the Spanish Super Cup against Atletico Madrid earlier in the season due to a thigh problem.
The 26-year-old had appeared in court in the coastal town of Gava near Barcelona on Friday morning to answer questions on accusations of tax evasion.
However, he took a full part in training on Friday with his teammates before travelling south to Almeria on Saturday.